John a



(No Model.) 2 Sheets-Sheet 1.

J.-A OABOT.

SAFETY DEVICE FOR INOANDESGENT LAMPS.

No. 324,980. Patented Aug. 25, 1885.

INVEN TOR @EESSES' Q Qgfla Nv PETERS. PhotwLllhogmphflr. Washington. D C,

(No Model.) 2 Sheets--S heet 2.

J. A. GABOT.

SAFETY DEVICE FOR INGANDESCENT LAMPS. No. 324,980. Patented Aug. 25, 1885.

E 8. N f M g Q N a 0% ATTORNEY UNITED STATES PATENT OFFICE.

JOHN A. CABOT, OF NEW YORK, N. Y., ASSIGNOR TO THE CABOT ELEC- TRIO LIGHT AND MANUFACTURING COMPANY, OF NEXV YORK.

SAFETY DEVICE FOR INCANDESCENT LAMPS.

SPECIFICATION forming part of Letters Patent No. 324,980, dated August 25, 1885.

Application filed March 3, 1884.

To all whom it may concern:

Be it known that 1, JOHN A. CABOT, of the city, county, and State of New York, have invented a new and useful Safety Device for Incandescent Lamps when Used on an Arc- Light Circuit, which is fully set forth in the following specification and accompanying drawings.

My device isto be used in connection with IO incandescent lamps connected in a multiple circuit interposed in a line of arc-lamps connected in series,and is for the purpose of pre venting a variation in the resistance of the multiple circuit,which would be caused by the 1 burning out of one or more of the incandescent lamps in such circuit.

My device consists in connecting,in the multiple circuit with the incandescent lamps, a solenoid with a sliding core, and inadapting the core of the solenoid to operate through a suitable switch, as hereinafter set forth, to switch one or more incandescent lamps into the said multiple circuit to supply the place of any which may burn out or become defect- .25 ive.

In the accompanying drawings, Figure 1 is a side view of my safety device. Fig. 2 is a front view thereof. Fig. 3 is a general View showing a number of arc-lamps in series and 0 a number of incandescent lamps in multiple circuit,together with my improved safety device, and Figs. 4 and 5 are detail views of the switch used.

A A are solenoids, one of which is connected in multiple circuit with each set of incandescent lamps. B is the core of the solenoids, made to slide longitudinally therein as the current is increased or diminished.

O is a fiat brass spring fastened securely to 0 and forming a continuation of the core B, and formed at its lower end into a tooth adapted to engage in a ratchet-wheel, D,mounted upon a shaft, 1', in insulated bearings.

E is a block of wood or similar material,

preferably made somewhat elliptical in form, mounted upon the shaft z and secured to the ratchet-wheel D.

A spring-pawl, K, is secured to the base of the switch and made to engage the ratchet- (No model.)

wheel D, to prevent a retrograde movement thereof.

A contactplate, g, is secured to and made to cover a portion of the block E, and is electrically connected with the shaft 2. The remaining portion of the surface of the block E, 5 5 or the greater part thereof, is covered with an insulating-plate, f.

A contact-spring,j, is made to bear upon the shaft i, and this spring j is electrically connected with one branch of the multiple circuit.

A series of contact-springs, Z Z l, are made to bear upon the surface of the block E, and these springs are each electrically connected through an incandescent lamp with the remaining branch of the multiple circuit. 6 5

A spiral spring, 11, is made to govern the movement of the solenoid-core, and its tension is regulated by the thumbscrew b.

The operation of my device is as follows, the lamps being arranged as shown in the drawings: WVhen one of the incandescent lamps in multiple circuit is accidentally broken, the solenoid, influenced by the altered current, causes the sliding core B to move upward and carry with it the spring-pawl 0, whereby the 7 5 ratchet-Wheel and switch-block E are rotated.

A sufficient rotation of the switch-block E will bring the contact-plate g in contact with one of the springs Z, and one of the lamps Z will be thrown into the multiple circuit. The current now returning to its first condition,the'core of the solenoid will drop back to its first position, ready to further rotate the switch-block when another lamp breaks. The operation of my device is not confined to use with incan- 8 descent lamps, but may be used with arc-lamps when they are connected in multiple circuit.

What I claim is- 1. The combination, with two or more electric lamps connected in multiple circuit, of a 0 rotating switch-block provided with contact plate or plates to successively switch into the circuit fresh lamps as those already in the circuit are destroyed, operated througha pawl and ratchet by the sliding core of a solenoid- 5 magnet connected in circuit with the lamps, substantially as and for the purpose set forth.

2. The combination, with two or more electric lamps in multiple circuit,and with asolenindependent lamp with the remaining branch oid in circuit therewith and provided with a of the multiple circuit substantially as and 10 sliding core of a pivoted switch-block profor the purpose set forth.

videcl with a contact-plate electrically connect- T i 5 ed with one branch of the multiple circuit,and JOEL CABOT' adapted to be brought by the rotation of the \Vitnesses: block into contact successively with a series DANIEL A. XVARREN,

0f contact-springs, each connected through an ARTHUR B. COOK. 

